<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    h1{
        width:100px;
        height:100px;
        background:red;
        margin-top: 100px;
        margin-bottom: 100px;
    }
    a{
        width:100px;
        height:100px;
        background:red;
        margin-top: 100px;
        margin-bottom: 100px;
    }
    input{
        width:100px;
        height:100px;  
        margin-top: 100px;
        margin-bottom: 100px;
    }
    </style>
</head>
<body>
    <h1>h1</h1>
    <p>p</p>
    <ul>
        <li>1</li>
        <li>2</li>
    </ul>
    <dl>
        <dt>dt</dt>
        <dd>dd</dd>
    </dl>
    <a href="#">a</a> <span>span</span> <i>i</i> <em>em</em> <strong>strong</strong>
    <br>
    <input type="text">
    <img src="images/icon1.png" alt="">
    <button>btn</button>
</body>
</html>